Charles Tritt / Mbed OS 21_TW_Ex_9_1_v5

Initial Mbed v. 5 version. Demonstrates ISR using two LED junctions, one blinking and one toggling.

main.cpp@109:e9badabfd93d, 2021-10-17 (annotated)

Committer:
CSTritt
Date:
Sun Oct 17 15:50:50 2021 +0000
Revision:
109:e9badabfd93d
Parent:
108:5621bbcc10f5 
Added circuit/wiring instructions.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
CSTritt 107:61b9c99a4e27 1 /*
CSTritt 108:5621bbcc10f5 2 Project: 21_TW_Ex_9_1_v5
CSTritt 108:5621bbcc10f5 3 File: main.cpp
CSTritt 108:5621bbcc10f5 4
CSTritt 108:5621bbcc10f5 5 An example similar to T&W example 9.1. Green junction will flash
CSTritt 108:5621bbcc10f5 6 continuously. Blue junction will toggle in response to depressing the user
CSTritt 108:5621bbcc10f5 7 button.
CSTritt 108:5621bbcc10f5 8
CSTritt 109:e9badabfd93d 9 Circuit (common cathode RGB LED needed)
CSTritt 109:e9badabfd93d 10
CSTritt 109:e9badabfd93d 11 Connect green junction anode to D3.
CSTritt 109:e9badabfd93d 12 Connect blue junction anode to D4.
CSTritt 109:e9badabfd93d 13 Connect common cathode to common (ground).
CSTritt 109:e9badabfd93d 14
CSTritt 109:e9badabfd93d 15 Created by Dr. C. S. Tritt
CSTritt 108:5621bbcc10f5 16 Last revised: 10/17/21 (v. 1.0)
CSTritt 107:61b9c99a4e27 17 */
Jonathan Austin 0:2757d7abb7d9 18 #include "mbed.h"
CSTritt 108:5621bbcc10f5 19
CSTritt 108:5621bbcc10f5 20 InterruptIn myButton(USER_BUTTON); // Button is normally high. Goes low w/press.
CSTritt 108:5621bbcc10f5 21
CSTritt 108:5621bbcc10f5 22 DigitalOut bluLED(D4); // Blue and green LED junctions.
CSTritt 108:5621bbcc10f5 23 DigitalOut grnLED(D3);
CSTritt 108:5621bbcc10f5 24
CSTritt 108:5621bbcc10f5 25 void myISR() { // Simple ISR toggles the blue LED junction when called.
CSTritt 108:5621bbcc10f5 26 bluLED = !bluLED; // Toggle blue junction.
CSTritt 108:5621bbcc10f5 27 }
CSTritt 108:5621bbcc10f5 28
CSTritt 108:5621bbcc10f5 29 int main() {
CSTritt 108:5621bbcc10f5 30 const int GRN_PERIOD = 500;
CSTritt 108:5621bbcc10f5 31 bluLED = 0; // Turn blue & green off at start.
CSTritt 108:5621bbcc10f5 32 grnLED = 0;
CSTritt 108:5621bbcc10f5 33
CSTritt 108:5621bbcc10f5 34 myButton.fall(&myISR); // "Register" the ISR routine. Sets vector.
CSTritt 108:5621bbcc10f5 35
CSTritt 108:5621bbcc10f5 36 while(true) {
CSTritt 108:5621bbcc10f5 37 grnLED = !grnLED; // Toggle green junction.
CSTritt 108:5621bbcc10f5 38 ThisThread::sleep_for(GRN_PERIOD); // Sleep for GRN_PERIOD mS.
CSTritt 108:5621bbcc10f5 39 }
CSTritt 108:5621bbcc10f5 40 }